Control system



Oct. 12, 1937. T. KUROKOCHI ET AL I 2,095,818

CONTROL SYSTEM Filed July 31, 1936 Inventors:

Tsutomu KuroKochi,

Isao Migamoto eh Attorney.

Patented Oct. 12, 1937 UNITED STATES PATENT OFFICE CONTROL SYSTEM Application July 31, 1 In Japan Au 2 Claims.

This invention relates to a control system for thread winding devices in spinning which is characterized in that a roller for tightening and guiding the thread is associated with the motor which drives an alternator for energizing a spindle motor with the output frequencies of the alternator, and its object is to provide a system for operating spinning thread winding devices for simultaneously stopping the roller and the spindle motor, and thereby preventing the breaking of the thread owing to its over-twisting and also suitable for individual driving of the bobbin.

Fig. 1 of the accompanying drawing is a diagrammatic view of the operating system for the spinning thread winding device embodying this invention and Fig. 2 is a modified arrangement.

In the spinning industry, the guide roller for leading the thread to a bobbin stops quickly when the driving power is removed but the spindle driving motor continues to rotate for a certain period owing to inertia so that the thread is likely to be broken owing to the resulting over-twisting.

An object of this invention is to stop the guide roller and bobbin driving motor simultaneously in a simple and positive manner.

Referring now to the drawing, thread is passed through a guide roller or drawing roller Ill to a plurality of bobbins or spindles not shown. Each of these spindles is separately driven by a corre sponding one of a plurality of induction motors ll, [2, l3, l4 and 5. The draw rolls H! are connected through gearing I 6 to the shaft ll of a motor generator set illustrated as comprising a direct current motor l8 and an alternating current generator l9, driven thereby. If desired the motor [8 and alternator l9 may be combined into a single machine having a common direct current field excitation. The spindle motors l I, I2, l3, I4 and I5 are connected to the slip rings of alternator l9 and are supplied with alternating voltage'of the required frequency so that the spindle motors rotate at a speed proportional to the speed of motor l8. Consequently, the spindles and draw rolls 10 are driven at corresponding speeds. The frequency of the alternating voltage generated by the alternator I 9 may be varied to change the speed of the spindle motors as desired. The voltage can be maintained substantially constant by varying the field excitation. The direct current motor I 8 is supplied from a direct current generator 2| which is driven by suitable driving means illustrated as an alternating current induction motor 22 supplied from a suitable source represented by supply lines 23. Generator 2| is provided with a .trolled by the builder motion. Motor 936, Serial No. 93,707 gust 31, 1935 field winding 2's, which is supplied from an exciter 24 driven by induction motor 22. In order to control and vary the speeds of the motor l8 and the spindle motors ll, l2, l3, l4 and IS, a variable resistance 25 is included in circuit with the field winding 2's. for varying the voltage of generator 2|. This resistance is preferably actuated by or controlled in accordance with the operation of the speed regulating device of the ring, rail or spindle frame which in turn is con- I8 is provided with a field winding I83 which is also supplied from exciter 24. A variable resistance 26 is included in circuit with field winding 8a for varying the basic speed of the motor I 8. A main switch 21 is included in the loop circuit of the armatures of generator 2| and motor l8.

With the connection and arrangement as described in the foregoing, the speed regulating device controlled by the ring rail will regulate the resistance 25 as the thread is Wound on a bobbin to regulate the voltage supplied to direct current motor l8 and will thereby regulate the output frequency of the alternating current generator I9 so that the speed motors ll, l2, l3, l4, I5, etc., sired and the tension of the thread can be maintained at constant throughout the winding opthe supply of current to the direct current motor I8 is interrupted and the output frequency of the alternator l9 will be gradually reduced in accordance with the stopping operation of the motor I8. The voltage of be sufiiciently high as the speed decreases if the excitation supplied by the exciter 24 is maintained constant. Thus, spindle motors H, l2, l3, l4, l5, etc., will receive an input of gradually diminishing frequency and the motor l8 and spindle motors H, l2, l3, l4, 15, etc., remain in substantial synchronism as their speeds are gradually reduced following to the decaying frequency or alternator Hi. When the generator l8, I9 is stopped, the generated alternating current frequency becomes zero and the spindle motors are likewise stopped. This is due to the fact that the spindle motors, which frequency. Since the guide roller H1 is connected to motor I 8 and various other parts it stops simultaneously with the stopping of the motor generator I8, I 9 and accordingly the roller l0 and. the spindle motors are stopped substantially simultaneously. As a result trouble due to breaking of threads is avoided.

In the modification of Fig. 2, the motor 28 which drives the alternator 29 and the guide roller 39 is supplied from a direct current source represented by supply lines 35. Speed varying resistances 32 and 33 are included in the field and armature circuits of motor 2%. Otherwise, the arrangement and operation are the same as previously described in connection with Fig. 1.

Thus in the present invention the alternator it is driven by a roller driving motor and the spindle driving alternating current motors are energized with the alternating current power of a generated frequency corresponding tothe driving speed of the roller so that the individual driv ing of the bobbin can be carried out simply and moreover the present invention has the advantage that th spindle motor can be stopped or its speed changed almost simultaneously with that of the roller.

What We claim as new and desire to secure by Letters Patent or the United States is:

1. A control system for textile machinery and the like comprising a plurality of alternating current induction motors for driving the spindles, a roller for guiding and tightening the threads supplied to the spindles, a direct current motor for driving said roller, a generator for supplying said direct current motor, a variable resistance in the field circuit of said generator for varying the voltage thereof in accordance with a winding condition of the thread on the bobbin, and an alternator driven by said direct current motor for supplying said spindle driving induction motors so that said spindle motors and roller driving motors operate in substantial synchronism.

2. A control system for spinning apparatus and the like comprising a plurality of alternating current motors for driving a plurality of spindles, a roller for guiding threads to said spindles, a source of direct current, a motor supplied from said source for driving said guide roller, said motor having a field winding, a variable resistance in circuit With said field winding adapted to be actuated in accordance with the winding condition of a bobbin for controlling the speed of said roller driving motor, and an alternator driven by said roller driving motor for supplying a voltage to said spindle motors having a frequency proportional to the speed of said roll driving motor so that said roller and spindles are operated in substantial synchronism.

' TSUTOMU KUROKOCHI.

ISAO MIYAMO-TO. 

